[Info-vax] Reclaim disk space for a 3PAR Storage Box

[Bill Gunshannon]

On 8/31/21 1:42 PM, Arne Vajhøj wrote:
> On 8/30/2021 10:03 PM, Dave Froble wrote:
>> On 8/30/2021 1:44 PM, Simon Clubley wrote:
>>> On 2021-08-30, Stephen Hoffman <seaohveh at hoffmanlabs.invalid> wrote:
>>>> A whole lot has changed with storage and storage I/O since HDDs reigned
>>>> supreme. 12 TB drives, and 4 TB SSDs are now commonplace, among other
>>>> differences.
>>>
>>> SSDs make me nervous because when they fail, they tend to fail hard
>>> and sudden without any warning.
>>
>> Never seen a total head crash on a HDD?  Ok, neither have I, but I 
>> have seen HDDs fail, and once they start, you cannot count on getting 
>> accurate data off them.
>>
>> Oh, and welcome to the new world of cheap and semi-reliable PC junk 
>> hardware ....
>>
>>> Hardware RAID or software volume shadowing would normally take care
>>> of that but there have been enough cases in recent years where a
>>> complete set of SSD devices all fail at the same time due to firmware
>>> bugs to make me nervous about using them.
>>
>> See above about cheap and semi-reliable PC junk hardware ....
> 
> There are usually some correlation between price and quality.
> 
> I have no doubt that:
> 
> MTBF(enterprise,2021) > MTBF(consumer,2021)
> MTBF(enterprise,1986) > MTBF(consumer,1986)
> 
> but at least for disk then:
> 
> MTBF(consumer,2021) > MTBF(enterprise,1986)
> 
> Modern disks are actually pretty reliable.
> 
> VAX disks were not always reliable. I remember a 8650
> with RA81's and RA82's - DEC field service replaced disks
> several times per year (especially the RA81's).
> 

Interesting.  I had about two dozen RA80's and 81's  That were
old and used when I got them.  Ran them for years on VAX and PDP-11's.
Never had a failure and passed them all on when I had to get rid of
those systems.  Would not be surprised to find they are still running.

bill